Throttle lever



Feb. 2, 1932. GR 1,843,153

THROTTLE LEVER Filed July 26, 1928 2 Sheets-Sheet l axvflgww BY M ATTORN EY J. R. GRAVES THROTTLE LEVER Filed July 26, 1928 2 Sheets-Sheet 2 Feb. 2, 1932.

7 2/ I Z2 210 5 I I r 7 c; -1 5 l A v 5 INVENTOR ATTORNEY it will be obvious from Patented Feb. 2, 1932 on: a... an...

PATENT OFFICE,

JOHN R. GRAVES, 0F YONKERS, NEW YORK THROTTLE LEVER Application filed July 26,

This invention relates to rigging for op erating locomotive throttles and particularly to that portion of such rigging by which the throttle lever is held in the desired position. While this is the principal use contemplated,

the ensuing description that the invention may have application in other relations.

The invention has for its purpose the provision ofapparatus of this kind which will allow a fine gradation of the various positions in which the throttle lever can be held and at the same time puts the quadrant of the device in such a position and makes possible making it of such size that it does not interfere with the movements of the engineer.

The invention is illustrated in the drawings filed herewith in which Fig. 1 shows the invention in lateral elevation, portions being broken away for-the sake of clearness;

' Fig. 2 shows an end elevation; Figs. 3 and 4 are sections on lines 3-3 and 4-4 respectively of Fig. 6; Fig. 5 is a section on line 55 of Fig. 6, and Fig. 6 is a sectional View on line 6-6 of Fig. 5; Figs. 3,4, 5 and 6 are 011 a larger scale than the first two figures.

The bracket 1 is secured by means of bolts or rivets passing through holes 2-2 to the rear portion of the boiler in the usual position. The throttle rod 3 reciprocates in the usual manner through a bearing in this bracket. This throttle rod it will be understood extends forward in the usual manner to the throttle which may be located either in the dome or at the forward end of the boiler. At the point 4 a bolt 5 passes through the two bearings 6-6 in the bracket and carries pivotally mounted on it the lever 7 This lever has an arm 7a extending generally downward and an arm 7 6 extending at approximately right-angles from the former. Two links 8-8 mounted pivotally at their ends by means of bolts 9 and 10 connect the throttle rod 3 to the lever 7. A lever 11 is pivotally mounted on the throttle lever 7 by means of the bolt 12. The arm 13 of this lever is connected by means of the link 14 to the lever 15. The latter is mounted pivotally on the lower portion of the throttle lever by the bolt 16 and has a handle 17 which is normally 1928. Serial No. 295,370.

spaced a little distance from the throttle lever handle 18 and is during the manipulation of the throttle pressed by the engineers hand toward this handle 18.

The other arm 19 of the lever 11 has c011- nected to it the link 20 by means of the bolt 21, and carries a pin 22. These two latches 23 and 24 are slidably mounted in the housing 25. The pin 22 is fixed firmly in the link 20 and extends into the slots 23a and 24a of the two latches respectively. A bolt 26 extends through the housing 25, through two slots 23b and 24b in the two latches respectively, and through arm 76 of the levers. Springs 230 and 240 engage the bolt 26 and the bottoms of the two slots 23b and 24b. Their pressure tends to place the latches into the position which the latch 24 occupies in Figs. 5 and 6. When the engineer moves handle 17 in a direction toward handle 18, pin 22 will engage the right hand side of the slots 23a and 24a and move the two latches toward the right in opposition to the compressive force of the two springs.

The left hand ends of the latches 23 and 24 are provided with teeth 23d and 24d. These teeth are adapted to engage the teeth of the two quadrants 27 and 28. These two quadrants are fixed to the bracket 1 by means of the bolts 29 and 30. Bolts 31 and 32 passing through them and the distance pieces and 34 further clamp these two quadrants in their relative position.

The two sides of the housing 25 and the 0 central piece engage the outer sides of the two quadrants as clearly shown in Fig. 5, and the end of 7?) extends between the two quadrants, thus guiding the latches in their arcuate movement about the point 4.

The two quadrants, as well as the two latches, all have teeth of the same shape and spacing. The teeth of the latches are abreast of each other, while the teeth of the quadrants are relatively staggered as appears clearly from an inspection of Fig. 6. As a result, only one of the latches can be in engagement with its quadrant at a given time, the teeth of the other latch riding on top of the teeth of its quadrant when the first latch and quadrant are in engagement. As a consequence a very much finer gradation is possible of the points at which the throttle lever can be locked. If, for instance, one of the latches is in engagement with its quadrant and it is desired to move the levera very small amount, it would be possible to lock it only after having traveled the full pitch of the t'eeth if there were only'onel'a'tch and quadrant used. With the arrangement described, it is possible to let the other latch engage its quadrant after traveling only half the pitch between adjacent teeth.

Of course the same fine gradationcanbe had with a single latch and quadrant and the same pitch of teeth;-if-the quadrant belocated at twicethe radial distancefrom the center 4,'or with a quadrant at the same dista'nce :but with'teeth ofhalf the pitch. In

the former case the quadrant would; have to r be twlce aslong and-when 1t 1s g ven such a length it'is constantly in the-engineers way and he is likely'to strike against it. With the lattenform the teeth? are too smallfor firim-engagement. In other words, with my improved arrangement the same gradationof'throttl'e setting is possible with a quad rantof-halfthelength of the-ordinary quadrant. g

It will'be understood that the specific arrangement described is only illustrativeof my inventive idea and that it may be considerably varied without departing from the spirit 4 of the invention. a

I claim:

In apparatus of. the class described, the combination of a lever pivotallyumounted on afixed pin, two fixed toothed-quadrants concentric with" the pin, -two toothed latches mounted on the leverradially slidableinto and out of engagement with the two quadrants respectively, andtresilient means urging-the latchesinto, and manual means to withdraw them frorn such engagement, the relative arrangement of the quadrant and latch'teeth being such that when onelatch is in engagement the teeth of the other latch ride on the teethof its quadrantythe' teeth of the" two latches beingabreast of each other and the teeth" of the two quadrants being relatively staggered.

1 JOHN R; GRAVES. 

